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Martin
Asked: 2010-03-16 03:44:20 +0800 CST

PCI-express - is there a typo in the Intel 5500 overview

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The overview for the 5500 and 5520 chipsets state that there is a total bandwidth of up to 48GB/s on each PCI Express x8 interface.

http://www.intel.com/products/server/chipsets/5500-5520/5500-5520-overview.htm

My understanding (admittedly from wikipedia) is that PCI-e Gen 2 runs at 500MB/s per lane. The 5520 has 36 lanes, and so would be limited to a total of 18GB/s.

Am I missing something here, or is Intel's claimed 48GB/s a typo that should say 18GB/s ?

pci-express

2 Answers

  1. To add to wazoox's post you are correct but I can see how they've got confused. The lowest-end-part, the 5500, has 24 x PCIe 1.1 channels, each at 2 giga-BIT/s, it's like a lowest-common denominator basically, i.e. they can both do 48 giga-BIT/s (or more of course) - someone's just used the wrong 'B'/'b' - happens all the time :)

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  2. Best Answer

    Certainly a typo. The datasheet says that you have 2 8GB/s 16x ports and 1 4x port.

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